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I am confused to heck - you say you have a sloped tile roof which needs replacement - not clear if your tiles are deteriorating (which would mean really poor quality tiles if they only lasted 25 years) or if the mortar bedding is deteriorating and needs replacement - in which case usually most of the tile can be reused if the roofer is half competent.

But peel and stick (assuming you mean peel-and-stick roofing, not peel-and-stick water barrier) and hot mop are permanent roofing types - so unless you mean changing from tile to a membrane roofing (which would be pretty rare if the roof slope is enough that the tile worked right for 25 years) I fail to understand the question.

For the water barrier UNDER the finish roofing material (the tiles), one would normally use roofing felt (tarpaper) or a synthetic membrane "roof wrap" like Tyvek Protec or such. In your quite hot locale and under tile I would definitely use the synthetic breathable underlayment.

If you actually mean going to a hot mop or membrane roofing (which personally I would NOT recommend in South Florida with the hurricane and thunderstorm wind blown debris issues), here are links to a number of previous questions with answers about membrane versus hot roof roofing: